EP3887780B1 - Vorrichtung zur berührungslosen messung des gewichts einer beweglichen anordnung - Google Patents

Vorrichtung zur berührungslosen messung des gewichts einer beweglichen anordnung Download PDF

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Publication number
EP3887780B1
EP3887780B1 EP19868177.7A EP19868177A EP3887780B1 EP 3887780 B1 EP3887780 B1 EP 3887780B1 EP 19868177 A EP19868177 A EP 19868177A EP 3887780 B1 EP3887780 B1 EP 3887780B1
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EP
European Patent Office
Prior art keywords
movable part
guide
movable
weight
permanent magnet
Prior art date
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Application number
EP19868177.7A
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English (en)
French (fr)
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EP3887780A1 (de
Inventor
Paolo STRINGARI
Thibault PLAYS
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Association Pour La Recherche Et Le Developement Des Methodes Et Procesus Industriels Armines
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Association Pour La Recherche Et Le Developement Des Methodes Et Procesus Industriels Armines
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups

Definitions

  • the present invention relates to the field of equipment for the non-contact measurement of weight implementing a principle of magnetic levitation, and in particular the field of scales and densimeters or measurement of viscosity, precise dosage or monitoring of reactive processes. or organic.
  • the general principle of such equipment is based on the magnetic levitation of a moving assembly receiving the load to be characterised, with a force sensor which measures the force applied to a magnet interacting magnetically with the moving assembly.
  • Such a balance is composed of a weighing module for data acquisition, a magnetic suspension coupling transmitting the weight of the sample without contact to the weighing module, a displacement sensor for positioning the suspended module as well as a regulator.
  • the transmission of the sample weight is done using a fixed magnet and a suspended magnet.
  • the suspended magnet is a permanent magnet
  • the fixed magnet is an electromagnet connected to the weighing module.
  • the geometry is of the vertical type with weight under the base.
  • the signal from the displacement sensor regulates the current of the electromagnet using a PID regulator allowing hold the magnet in suspension. This keeps the weigh module at ambient conditions and protects it from extreme temperatures and pressures as well as corrosive gases. This makes it possible to achieve measurement conditions in a temperature and pressure range that cannot be achieved with a conventional thermobalance.
  • German patent DE102016205377 describing a measuring device for determining a force acting on a measuring body, comprising a measuring body, to which is associated a first arrangement of magnets and with a sensor to which is associated a second arrangement of magnets which, for an interaction mutual magnetic, allows a contactless coupling between the measuring body and the sensor.
  • one of the magnetic arrangements comprises a superconductor and the other of the magnetic arrangements comprises a permanent magnet
  • the sensor is associated with a sensor device for determining a physical quantity for the force coupling between the measuring body and the sensor and wherein an evaluation device is provided for processing a sensor signal provided by the sensor device.
  • the European patent EP0170709 describes a device making it possible to couple without contact a floating part provided with a magnet in a casing to a device making it possible to measure a force external to the casing which is connected to an electromagnet.
  • the European patent EP170709 describes another known embodiment of a device for contactless coupling of a suspended part with a force sensor, in which the suspended part is located in a housing and is provided with a magnet, and the force sensor is located at the exterior of the case and is provided with a controllable electromagnet, the control of the electromagnet occurring according to the output of a measuring device for ascertaining the distance between the two magnets by means of a regulation circuit for maintaining this distance, characterized in that the measuring device is mounted fixed relative to the housing and in particular inside this housing, and that, instead of maintaining the distance between the magnets, it is maintaining a given nominal position of the suspended part in relation to the casing which determines the control of the electromagnet.
  • the patent EP0594033 describes another exemplary embodiment, known in the prior art, of a device consisting of at least one stabilizing device and preferably of at least one relief device for receiving, for example, the self-weight of a shaft or forces static, the stabilizing device consisting of magnets which are arranged in pairs on each side of an interposed, non-magnetic electrically conductive material, for example in flat form or in the form of a hollow cylinder and which induce eddy currents of direction opposites in the above-mentioned matter, and the matter interposed between the magnets being centered and the eddy currents which tend to pull the matter back becoming dominant as the matter shifts from its centered position and thus exerting a stabilizing force, characterized in that the thickness of the material corresponds at most to the depth of magnetic penetration and the magnets are oriented in such a way that the eddy currents mentioned above compensate each other to a large extent in normal operation and do not exert any noticeable braking force.
  • Some solutions implement an electromagnet and employ control systems to control the magnetic field in order to produce the restoring forces which act directly on the suspended body. These solutions require a complex electronic circuit.
  • the present invention is based on a solution for stabilizing the moving magnet by a transversely vibrating non-magnetic guide passing through a moving magnet aligned with a fixed magnet magnetized in the opposite direction along the axis of said non-magnetic guide.
  • This transversely vibrating guide continuously moves the contact points between the guide and the channel passing through the movable magnet.
  • the invention relates, according to its most general meaning, to equipment for the non-contact measurement of the weight of a movable assembly in translation along a vertical axis Z, said movable assembly comprises a permanent magnet APM magnetized along said axis Z and means for ensuring the magnetic levitation of said movable assembly, said levitation means being associated with a means for measuring the force exerted between said movable assembly and said levitation means.
  • the relative vibratory movement makes it possible to reduce the impact of the friction of the mobile magnet relative to the guide and to ensure a reliable and undisturbed measurement.
  • said moving assembly is placed in an enclosure for filling with a fluid.
  • This enclosure makes it possible to isolate the mass to be measured or to measure the density of a fluid in which the moving assembly is immersed.
  • said enclosure includes means for controlling at least one physical parameter such as temperature or pressure.
  • said measurement enclosure has an inlet and an outlet for the continuous measurement of the density of a circulating fluid.
  • said measurement enclosure is closed in a sealed manner.
  • said moving assembly has a physico-chemical active surface.
  • said fixed permanent magnet is secured to a balance.
  • said moving assembly has a very low coefficient of expansion.
  • “Very low coefficient of expansion” will be understood to mean a coefficient of linear expansion lower, at room temperature, than 10 -5 C -1 , for example of Invar (registered trademark designating an alloy, for example 36% Ni + 64% Fe), titanium, porcelain, quartz, glass, soapstone or Zerodur (trade name).
  • Invar registered trademark designating an alloy, for example 36% Ni + 64% Fe
  • Ti titanium, porcelain, quartz, glass, soapstone or Zerodur (trade name).
  • the play between the guide and the passage in the moving assembly allows said moving assembly to tilt by a maximum angle of between 0.05° and 0.5°.
  • said guide is excited by an electromagnetic actuator.
  • the equipment described with reference to the figure 1 comprises two permanent magnets (1, 2) aligned along a Z axis and magnetized in opposite directions along a vertical Z axis.
  • the first permanent magnet (1) is fixed and integral with the plate (3) of a balance (4).
  • the second permanent magnet (2) is mobile and has a median axial guide channel, of cylindrical section (5).
  • This median channel (5) is traversed by a non-magnetic guide (6), for example made of titanium.
  • This guide (6) is driven by a vibratory movement comprising one or more transverse components (that is to say perpendicular to the Z axis).
  • the actuation of this vibratory movement is ensured by a vibrating actuator (7).
  • the opposite end of the guide (6) can be fixed or free.
  • the instability of the magnet (2) resulting from Earnshaw's theorem causes tilting with respect to the transverse plane.
  • the angular amplitude of this tilting is limited by the play between the channel (5) and the guide (6). Typically, this play allows a displacement of 0.1°, and preferably less than 1°.
  • the transverse vibrations of the guide (6) cause a permanent displacement of the point of contact between the channel (5) and the guide (6), with periods of passage from one point of contact to another, often diametrically opposed, during which there is no contact between the guide (6) and the magnet (2), and therefore no friction.
  • the vibration frequency is chosen so as not to correspond to a natural frequency of the moving assembly. Typically, a frequency between 50 and 1000 hz has been experimentally determined to be suitable.
  • the frequency of the vibrations can be determined empirically by changing the frequency by jumps, and by observing the fluctuations of the indications of the balance.
  • the frequency is considered to be suitable when the scale indications are stable and converge most rapidly towards an invariant indication.
  • a necessary condition to be able to consider that a frequency is adapted is that the indication of the balance returns to the same value after several disturbances of the balance of the system (repeatability).
  • the equipment described with reference to the picture 2 comprises two permanent magnets (1, 2) aligned along a Z axis and magnetized in opposite directions along a vertical Z axis.
  • the first permanent magnet (1) is fixed and integral with the plate (3) of a balance (4).
  • the second permanent magnet (2) is mobile and has a median axial guide channel, of cylindrical section. This median channel (5) is traversed by a non-magnetic guide (6), for example made of titanium.
  • This guide (6) is in this second fixed embodiment, aligned along a vertical axis Z centered with respect to the two magnets (1, 2).
  • this second embodiment involves vibration of the magnet (2) caused by a coil (15) powered by an alternating current generator at a low frequency, typically between 0 ,1 Hz and 10 Hz, and preferably between 0.5 and 3 Hz.
  • the intensity of the field will be determined to produce a displacement of the magnet (2) with respect to the equilibrium position of between ⁇ 0.5 and ⁇ 5 millimeters, typically ⁇ 2 millimeters.
  • the vibratory displacement of the magnet (2) along the vertical axis makes it possible to eliminate the effect of the friction forces on the weight of the magnet (2) in the case of an acquisition of the weight measurement of the mobile assembly for a time significantly greater than one period of vibration.
  • the friction forces are freed by the acquisition over time of the value of the weight.
  • the friction will have an influence on the amplitude of the movement of the float, but not on the average value of the measured weight.
  • the average value is therefore the actual weight.
  • the weight measurement is carried out by the average of the balance measurement, over a period of a few oscillations, typically 10 to 100 oscillations of the magnet (2).
  • a minimal error will on the other hand be induced because of the asymmetry of the magnetic force applied by the coil (15) on the magnet (2), the distance between the two not being constant.
  • This error can be estimated by a simulation or by a calibration with reference masses or densities, to adjust the calculation of the average by a correction factor to take this residual error into account.
  • the equipment can be used for different types of measurement.
  • the enclosure may have an inlet duct (10) and a fluid discharge duct (11).

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Claims (12)

  1. Einrichtung für die berührungslose Messung des Gewichts einer bewegbaren Ausrüstung, die entlang einer vertikalen Achse Z verschoben wird, wobei die bewegbare Ausrüstung einen Permanentmagneten APM (2), der entlang der Z-Achse magnetisiert ist, und Mittel zum Sicherstellen des magnetischen Schwebens der bewegbaren Ausrüstung aufweist, wobei das Mittel zum Schweben einem Mittel zum Messen der Kraft zugeordnet ist, die zwischen der bewegbaren Ausrüstung und dem Mittel zum Schweben ausgeübt wird,
    dadurch gekennzeichnet, dass
    das Mittel zum Schweben ein Permanentmagnet APF (1) ist, der entlang der Z-Achse magnetisiert ist, der zu der Magnetisierung des bewegbaren Permanentmagneten APM (2) entgegengesetzt ist, wobei die Magnete APM (2) und APF (1) entlang der vertikalen Z-Achse durch eine nicht magnetische Führung (6) ausgerichtet sind, die durch die bewegbare Ausrüstung verläuft,
    die Einrichtung ferner umfassend ein Mittel zum Anwenden einer Schwingungsverlegung des bewegbaren Permanentmagneten APM (2) hinsichtlich der Führung (6).
  2. Einrichtung für die berührungslose Messung des Gewichts einer bewegbaren Ausrüstung nach Anspruch 1, dadurch gekennzeichnet, dass die Führung (6) von einer radialen Schwingungsbewegung angetrieben wird, umfassend mindestens eine radiale Komponente.
  3. Einrichtung für die berührungslose Messung des Gewichts einer bewegbaren Ausrüstung nach Anspruch 1, dadurch gekennzeichnet, dass der Magnet (2) einem schwingenden Magnetfeld entlang der vertikalen Achse Z ausgesetzt ist und dass er ein Mittel zum Berechnen des Durchschnitts der durch das Mittel zum Messen gemessenen Kräfte aufweist.
  4. Einrichtung für die berührungslose Messung des Gewichts einer bewegbaren Ausrüstung, die verschoben wird, nach Anspruch 1, dadurch gekennzeichnet, dass die bewegbare Ausrüstung in einem Behälter (9) zum Füllen mit einem Fluid angeordnet ist.
  5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Behälter (9) Mittel zum Steuern mindestens eines physikalischen Parameters aufweist.
  6. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Behälter (9) einen Einlass (10) und einen Auslass (11) zum kontinuierlichen Messen der Dichte eines zirkulierenden Fluids vorweist.
  7. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Behälter (9) druckdicht verschlossen ist.
  8. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der stationäre Permanentmagnet (1) mit einer Waage (4) fest verbunden ist.
  9. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die bewegbare Ausrüstung bei Umgebungstemperatur einen linearen Ausdehnungskoeffizienten von weniger als 10-5 C-1 vorweist.
  10. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Spiel zwischen der Führung und dem Durchgang in der bewegbaren Ausrüstung eine Neigung der bewegbaren Ausrüstung um einen maximalen Winkel zwischen 0,05° und 0,5° ermöglicht.
  11. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Führung (6) durch ein Magnetstellwerk (7) erregt wird.
  12. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass das Spiel zwischen der Führung und dem Durchgang in der bewegbaren Ausrüstung eine Neigung der bewegbaren Ausrüstung um einen maximalen Winkel zwischen 0,05° und 0,5° ermöglicht.
EP19868177.7A 2018-11-27 2019-11-26 Vorrichtung zur berührungslosen messung des gewichts einer beweglichen anordnung Active EP3887780B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1871879A FR3089077B1 (fr) 2018-11-27 2018-11-27 Équipement pour la mesure sans contact du poids d’un equipage mobile
PCT/FR2019/052804 WO2020109713A1 (fr) 2018-11-27 2019-11-26 Équipement pour la mesure sans contact du poids d'un equipage mobile

Publications (2)

Publication Number Publication Date
EP3887780A1 EP3887780A1 (de) 2021-10-06
EP3887780B1 true EP3887780B1 (de) 2023-01-04

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EP19868177.7A Active EP3887780B1 (de) 2018-11-27 2019-11-26 Vorrichtung zur berührungslosen messung des gewichts einer beweglichen anordnung

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EP (1) EP3887780B1 (de)
FR (1) FR3089077B1 (de)
WO (1) WO2020109713A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113375888B (zh) * 2021-04-29 2022-12-27 中国航天空气动力技术研究院 一种动静态气动载荷分离测量的电磁悬浮测力装置及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2239151A5 (en) * 1973-07-25 1975-02-21 Cambridge Thermionic Corp Magnetic seating with permanent magnets and electromagnets - has permanent magnets for static load part and electromagnets for controlled positioning
EP0170709B1 (de) 1984-08-02 1988-06-01 Hans-Wilhelm Lösch Vorrichtung zur berührungslosen Ankoppelung eines hängenden Schwebeteils an eine Kraftmesseinrichtung
SE9203090L (sv) * 1992-10-22 1994-04-18 Torbjoern Lembke Virvelströmsinducerande magnetlager samt en användning av lagret
JP4229895B2 (ja) 2004-10-08 2009-02-25 独立行政法人産業技術総合研究所 磁気浮上密度計
ATE473544T1 (de) 2005-12-08 2010-07-15 Eth Zuerich Magnetisches schwebesystem
DE102015116767B4 (de) 2015-10-02 2020-06-18 Rubotherm GmbH Lager, insbesondere für eine Magnetschwebeanordnung
DE102016205377B3 (de) 2016-03-31 2017-08-03 Festo Ag & Co. Kg Messanordnung und Verfahren zum Betreiben einer Messanordnung

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Publication number Publication date
FR3089077B1 (fr) 2020-10-30
EP3887780A1 (de) 2021-10-06
WO2020109713A1 (fr) 2020-06-04
FR3089077A1 (fr) 2020-05-29

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